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id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2023-04-08T03:00:00.000Z" title="发表于 2023-04-08 03:00:00">2023-04-08</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2023-08-30T18:00:49.041Z" title="更新于 2023-08-30 18:00:49">2023-08-30</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/Web-APIs%E7%AC%94%E8%AE%B0/">Web APIs笔记</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span data-flag-title="Web APIs第四天"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="twikoo_visitors"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h3 id="DOM-事件高级"><a href="#DOM-事件高级" class="headerlink" title="DOM- 事件高级"></a>DOM- 事件高级</h3><h2 id="1-事件对象"><a href="#1-事件对象" class="headerlink" title="1. 事件对象"></a>1. 事件对象</h2><h3 id="1-获取事件对象"><a href="#1-获取事件对象" class="headerlink" title="1. 获取事件对象"></a>1. 获取事件对象</h3><ol><li>事件对象是个对象, 这个对象里有事件触发时的相关信息</li><li>例如：鼠标点击事件中，事件对象就存了鼠标点在哪个位置等信息</li><li>获取: 在事件绑定的回调函数的第一个参数就是事件对象, 一般命名为event、ev、e</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 1. 事件对象</span></span><br><span class="line"><span class="keyword">let</span> num1 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;button&#x27;</span>)</span><br><span class="line">num1.<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params">e</span>) &#123;</span><br><span class="line">    <span class="variable language_">console</span>.<span class="title function_">log</span>(e)</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h3 id="2-事件对象常用属性"><a href="#2-事件对象常用属性" class="headerlink" title="2. 事件对象常用属性"></a>2. 事件对象常用属性</h3><ol><li>部分常用属性: type 获取当前的事件类型</li><li>clientX&#x2F;clientY: 获取光标相对于浏览器可见窗口左上角的位置</li><li>offsetX&#x2F;offsetY: 获取光标相对于当前DOM元素左上角的位置</li><li>key: 用户按下的键盘键的值, 现在不提倡使用keyCode</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 2. 事件对象常用属性</span></span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params">e</span>) &#123;</span><br><span class="line">    <span class="comment">// 当前视口坐标</span></span><br><span class="line">    <span class="variable language_">console</span>.<span class="title function_">log</span>(e.<span class="property">clientX</span>, e.<span class="property">clientY</span>)</span><br><span class="line">    <span class="comment">// 整个页面坐标</span></span><br><span class="line">    <span class="variable language_">console</span>.<span class="title function_">log</span>(e.<span class="property">pageX</span>, e.<span class="property">pageY</span>)</span><br><span class="line">    <span class="comment">// 当前元素坐标</span></span><br><span class="line">    <span class="variable language_">console</span>.<span class="title function_">log</span>(e.<span class="property">offsetX</span>, e.<span class="property">offsetY</span>)</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h4 id="跟随鼠标案例"><a href="#跟随鼠标案例" class="headerlink" title="跟随鼠标案例:"></a>跟随鼠标案例:</h4><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">需求：一张图片一直跟着鼠标移动</span><br><span class="line"><span class="comment">// 3. 跟随鼠标案例</span></span><br><span class="line"><span class="keyword">let</span> img = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;img&#x27;</span>)</span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">addEventListener</span>(<span class="string">&#x27;mousemove&#x27;</span>, <span class="keyword">function</span> (<span class="params">e</span>) &#123;</span><br><span class="line">    <span class="comment">// 不断获取当前鼠标坐标 把坐标给图片</span></span><br><span class="line">    img.<span class="property">style</span>.<span class="property">top</span> = e.<span class="property">pageY</span>  + -<span class="number">30</span> + <span class="string">&#x27;px&#x27;</span></span><br><span class="line">    img.<span class="property">style</span>.<span class="property">left</span> = e.<span class="property">pageX</span> + -<span class="number">30</span> +<span class="string">&#x27;px&#x27;</span></span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h4 id="按下回车发布微博案例"><a href="#按下回车发布微博案例" class="headerlink" title="按下回车发布微博案例:"></a>按下回车发布微博案例:</h4><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line">①：用到按下键盘事件 keydown 或者 keyup 都可以</span><br><span class="line">②：如果用户按下的是回车键盘，则发布信息</span><br><span class="line">③：按下键盘发布新闻，其实和点击发布按钮效果一致 send.<span class="title function_">click</span>()</span><br><span class="line"><span class="comment">// 1.事件侦听三要素 键盘事件 发布信息</span></span><br><span class="line"><span class="comment">// 2.keyup 按下键盘松开后触发</span></span><br><span class="line"><span class="comment">// 3.keydown 按下键盘就触发  场景: 拖拽使用</span></span><br><span class="line">text.<span class="title function_">addEventListener</span>(<span class="string">&#x27;keyup&#x27;</span>, <span class="keyword">function</span> (<span class="params">e</span>) &#123;</span><br><span class="line">    <span class="comment">// console.log(e)   // e.keyCode(废弃)</span></span><br><span class="line">    <span class="comment">// 4.现使用key</span></span><br><span class="line">    <span class="variable language_">console</span>.<span class="title function_">log</span>(e.<span class="property">key</span>)</span><br><span class="line">    <span class="keyword">if</span> (e.<span class="property">key</span> == <span class="string">&#x27;Enter&#x27;</span>) &#123;</span><br><span class="line">        <span class="comment">// 5.自动触发点击按钮</span></span><br><span class="line">        send.<span class="title function_">click</span>()</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h2 id="2-事件流"><a href="#2-事件流" class="headerlink" title="2. 事件流"></a>2. 事件流</h2><h3 id="1-事件流和两个阶段说明"><a href="#1-事件流和两个阶段说明" class="headerlink" title="1. 事件流和两个阶段说明"></a>1. 事件流和两个阶段说明</h3><ol><li>事件流指的是事件完整执行过程中的流动路径</li><li>说明：假设页面里有个div，当触发事件时，会经历两个阶段，分别是捕获阶段、冒泡阶段</li><li>简单来说：捕获阶段是 从父到子 冒泡阶段是从子到父</li></ol><img src="" data-lazy-src="https://cdn1.tianli0.top/gh/web-xc/iMG/postss/%E4%BA%8B%E4%BB%B6%E6%B5%81.jpg" style="zoom:33%"><h3 id="2-事件捕获和事件冒泡"><a href="#2-事件捕获和事件冒泡" class="headerlink" title="2. 事件捕获和事件冒泡"></a>2. 事件捕获和事件冒泡</h3><h4 id="事件冒泡概念"><a href="#事件冒泡概念" class="headerlink" title="事件冒泡概念:"></a>事件冒泡概念:</h4><ol><li>当一个元素事件被触发时, 同样的事件将会在该元素的所有祖先元素中依次被触发, 这一过程被称为事件冒泡</li><li>简单理解：当一个元素触发事件后，会依次向上调用所有父级元素的同名事件</li><li>事件冒泡是默认存在的</li></ol><h4 id="事件捕获概念："><a href="#事件捕获概念：" class="headerlink" title="事件捕获概念："></a>事件捕获概念：</h4><ol><li>从DOM的根元素开始去执行对应的事件 (从外到里)</li><li>事件捕获需要写对应代码才能看到效果</li></ol><h4 id="说明"><a href="#说明" class="headerlink" title="说明:"></a>说明:</h4><ol><li>addEventListener第三个参数传入true代表是捕获阶段触发（很少使用）</li><li>若传入false代表冒泡阶段触发，默认就是false</li><li>若是用 L0 事件监听，则只有冒泡阶段，没有捕获</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 1. 冒泡事件阶段(理解)</span></span><br><span class="line"><span class="keyword">let</span> num1 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.box&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> num2 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.box1&#x27;</span>)</span><br><span class="line">num1.<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params">e</span>) &#123;</span><br><span class="line">    <span class="title function_">alert</span>(<span class="string">&#x27;我是爸爸&#x27;</span>)</span><br><span class="line">    e.<span class="title function_">stopPropagation</span>()</span><br><span class="line"><span class="comment">// 2. 捕获事件阶段(了解)</span></span><br><span class="line">&#125;, <span class="literal">true</span>)</span><br><span class="line">num2.<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params">e</span>) &#123;</span><br><span class="line">    <span class="title function_">alert</span>(<span class="string">&#x27;我是儿子&#x27;</span>)</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h3 id="3-阻止事件流动"><a href="#3-阻止事件流动" class="headerlink" title="3. 阻止事件流动"></a>3. 阻止事件流动</h3><ol><li>因为默认就有冒泡模式的存在，所以容易导致事件影响到父级元素</li><li>若想把事件就限制在当前元素内，就需要阻止事件流动</li><li>阻止事件流动需要拿到事件对象</li><li>此方法可以阻断事件流动传播，不光在冒泡阶段有效，捕获阶段也有效</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 3. 阻止事件流动 Propagation(传播)</span></span><br><span class="line">    e.<span class="title function_">stopPropagation</span>()</span><br><span class="line">&#125;, <span class="literal">false</span>)</span><br></pre></td></tr></table></figure><h4 id="鼠标经过事件："><a href="#鼠标经过事件：" class="headerlink" title="鼠标经过事件："></a>鼠标经过事件：</h4><ol><li>mouseover 和 mouseout 会有冒泡效果</li><li>mouseenter 和 mouseleave 没有冒泡效果(推荐)</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// mouseover/out会有冒泡 enter/leave没有(推荐)</span></span><br><span class="line">num1.<span class="title function_">addEventListener</span>(<span class="string">&#x27;mouseover&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="number">11</span>)</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h4 id="阻止默认行为，比如链接点击不跳转，表单域的跳转"><a href="#阻止默认行为，比如链接点击不跳转，表单域的跳转" class="headerlink" title="阻止默认行为，比如链接点击不跳转，表单域的跳转"></a>阻止默认行为，比如链接点击不跳转，表单域的跳转</h4><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 5. 阻止默认行为 方法 链接不跳转/表单并提交</span></span><br><span class="line"><span class="keyword">let</span> num3 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;a&#x27;</span>)</span><br><span class="line">num3.<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params">e</span>) &#123;</span><br><span class="line">    e.<span class="title function_">preventDefault</span>()</span><br><span class="line">    e.<span class="title function_">stopPropagation</span>()</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h4 id="两种注册事件的区别："><a href="#两种注册事件的区别：" class="headerlink" title="两种注册事件的区别："></a>两种注册事件的区别：</h4><p><strong>传统on注册（L0）</strong></p><ol><li>同一个对象,后面注册的事件会覆盖前面注册(同一个事件)</li><li>直接使用null覆盖偶就可以实现事件的解绑, 都是冒泡阶段执行的</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> num4 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;button&#x27;</span>)</span><br><span class="line"><span class="comment">// 多次相同事件只执行最后一次</span></span><br><span class="line">num4.<span class="property">onclick</span> = <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="title function_">alert</span>(<span class="string">&#x27;你好&#x27;</span>)</span><br><span class="line">&#125;</span><br><span class="line">num4.<span class="property">onclick</span> = <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="title function_">alert</span>(<span class="string">&#x27;你好1&#x27;</span>)</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">// 解除绑定事件</span></span><br><span class="line">num4.<span class="property">onclick</span> = <span class="literal">null</span></span><br></pre></td></tr></table></figure><p><strong>事件监听注册（L2）</strong></p><ol><li>语法: addEventListener(事件类型, 事件处理函数, 是否使用捕获)</li><li>后面注册的事件不会覆盖前面注册的事件(同一个事件)</li><li>可以通过第三个参数去确定是在冒泡或者捕获阶段执行</li><li>必须使用removeEventListener(事件类型, 事件处理函数, 获取捕获或者冒泡阶段)</li><li>匿名函数无法被解绑</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> num5 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.btn&#x27;</span>)</span><br><span class="line">num5.<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="title function_">alert</span>(<span class="string">&#x27;你好&#x27;</span>)</span><br><span class="line">&#125;)</span><br><span class="line"></span><br><span class="line"><span class="comment">// 2. 事件监听注册L2</span></span><br><span class="line"><span class="comment">// 不会覆盖前面事件</span></span><br><span class="line">num5.<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, add)</span><br><span class="line"><span class="keyword">function</span> <span class="title function_">add</span>(<span class="params"></span>) &#123;</span><br><span class="line">    <span class="title function_">alert</span>(<span class="string">&#x27;你好1&#x27;</span>)</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">// 解除绑定事件</span></span><br><span class="line">num5.<span class="title function_">removeEventListener</span>(<span class="string">&#x27;click&#x27;</span>, add)</span><br></pre></td></tr></table></figure><h2 id="3-事件委托"><a href="#3-事件委托" class="headerlink" title="3. 事件委托"></a>3. 事件委托</h2><ol><li>事件委托是利用事件流的特征解决一些开发需求的知识技巧</li><li>优点：给父级元素加事件（可以提高性能）</li><li>原理：事件委托其实是利用事件冒泡的特点</li><li>实现：事件对象.target 可以获得真正触发事件的元素</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 不是给每个li注册事件 而是委托给父级</span></span><br><span class="line"><span class="keyword">let</span> num6 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;ul&#x27;</span>)</span><br><span class="line">num6.<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params">e</span>) &#123;</span><br><span class="line">    e.<span class="property">target</span>.<span class="property">style</span>.<span class="property">color</span> = <span class="string">&#x27;red&#x27;</span></span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h2 id="4-购物车案例"><a href="#4-购物车案例" class="headerlink" title="4. 购物车案例"></a>4. 购物车案例</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br></pre></td><td class="code"><pre><span class="line">    &lt;div <span class="keyword">class</span>=<span class="string">&quot;car&quot;</span>&gt;</span><br><span class="line">  <span class="language-xml"><span class="tag">&lt;<span class="name">table</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;<span class="name">thead</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">      <span class="tag">&lt;<span class="name">tr</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;<span class="name">th</span>&gt;</span><span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">&quot;checkbox&quot;</span> <span class="attr">id</span>=<span class="string">&quot;all&quot;</span> /&gt;</span>全选<span class="tag">&lt;/<span class="name">th</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;<span class="name">th</span>&gt;</span>商品<span class="tag">&lt;/<span class="name">th</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;<span class="name">th</span>&gt;</span>单价<span class="tag">&lt;/<span class="name">th</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;<span class="name">th</span>&gt;</span>商品数量<span class="tag">&lt;/<span class="name">th</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;<span class="name">th</span>&gt;</span>小计<span class="tag">&lt;/<span class="name">th</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;<span class="name">th</span>&gt;</span>操作<span class="tag">&lt;/<span class="name">th</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">      <span class="tag">&lt;/<span class="name">tr</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;/<span class="name">thead</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;<span class="name">tbody</span> <span class="attr">id</span>=<span class="string">&quot;carBody&quot;</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">      <span class="tag">&lt;<span class="name">tr</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;<span class="name">td</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">          <span class="tag">&lt;<span class="name">input</span> <span class="attr">class</span>=<span class="string">&quot;s_ck&quot;</span> <span class="attr">type</span>=<span class="string">&quot;checkbox&quot;</span> <span class="attr">readonly</span> /&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;/<span class="name">td</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;<span class="name">td</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">          <span class="tag">&lt;<span class="name">img</span> <span class="attr">src</span>=<span class="string">&quot;./images/01.jpg&quot;</span> /&gt;</span></span></span><br><span class="line"><span class="language-xml">          <span class="tag">&lt;<span class="name">p</span>&gt;</span>牛奶<span class="tag">&lt;/<span class="name">p</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;/<span class="name">td</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;<span class="name">td</span> <span class="attr">class</span>=<span class="string">&quot;price&quot;</span>&gt;</span>5￥<span class="tag">&lt;/<span class="name">td</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;<span class="name">td</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">          <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;count-c clearfix&quot;</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">            <span class="tag">&lt;<span class="name">button</span> <span class="attr">class</span>=<span class="string">&quot;reduce&quot;</span> <span class="attr">disabled</span>&gt;</span>-<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">            <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">&quot;text&quot;</span> <span class="attr">value</span>=<span class="string">&quot;1&quot;</span> /&gt;</span></span></span><br><span class="line"><span class="language-xml">            <span class="tag">&lt;<span class="name">button</span> <span class="attr">class</span>=<span class="string">&quot;add&quot;</span>&gt;</span>+<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">          <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;/<span class="name">td</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;<span class="name">td</span> <span class="attr">class</span>=<span class="string">&quot;total&quot;</span>&gt;</span>5￥<span class="tag">&lt;/<span class="name">td</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">        <span class="tag">&lt;<span class="name">td</span>&gt;</span><span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">&quot;javascript:&quot;</span> <span class="attr">class</span>=<span class="string">&quot;del&quot;</span>&gt;</span>删除<span class="tag">&lt;/<span class="name">a</span>&gt;</span><span class="tag">&lt;/<span class="name">td</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">      <span class="tag">&lt;/<span class="name">tr</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;/<span class="name">tbody</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">  <span class="tag">&lt;/<span class="name">table</span>&gt;</span></span></span><br><span class="line">  <span class="language-xml"><span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;controls clearfix&quot;</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">&quot;javascript:&quot;</span> <span class="attr">class</span>=<span class="string">&quot;del-all&quot;</span>&gt;</span>删除所选商品<span class="tag">&lt;/<span class="name">a</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">&quot;javascript:&quot;</span> <span class="attr">class</span>=<span class="string">&quot;clear&quot;</span>&gt;</span>清理购物车<span class="tag">&lt;/<span class="name">a</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">&quot;javascript:&quot;</span> <span class="attr">class</span>=<span class="string">&quot;pay&quot;</span>&gt;</span>去结算<span class="tag">&lt;/<span class="name">a</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;<span class="name">p</span>&gt;</span>已经选中<span class="tag">&lt;<span class="name">span</span> <span class="attr">id</span>=<span class="string">&quot;totalCount&quot;</span>&gt;</span>0<span class="tag">&lt;/<span class="name">span</span>&gt;</span>件商品;总价：<span class="tag">&lt;<span class="name">span</span> <span class="attr">id</span>=<span class="string">&quot;totalPrice&quot;</span> <span class="attr">class</span>=<span class="string">&quot;total-price&quot;</span>&gt;</span>0￥<span class="tag">&lt;/<span class="name">span</span>&gt;</span><span class="tag">&lt;/<span class="name">p</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">  <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line">&lt;/div&gt;</span><br><span class="line"><span class="keyword">let</span> btn = <span class="variable language_">document</span>.<span class="title function_">querySelectorAll</span>(<span class="string">&#x27;.reduce&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> btn1 = <span class="variable language_">document</span>.<span class="title function_">querySelectorAll</span>(<span class="string">&#x27;.add&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> input = <span class="variable language_">document</span>.<span class="title function_">querySelectorAll</span>(<span class="string">&#x27;.count-c input&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> del = <span class="variable language_">document</span>.<span class="title function_">querySelectorAll</span>(<span class="string">&#x27;.del&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> price = <span class="variable language_">document</span>.<span class="title function_">querySelectorAll</span>(<span class="string">&#x27;.price&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> total = <span class="variable language_">document</span>.<span class="title function_">querySelectorAll</span>(<span class="string">&#x27;.total&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> totalCount = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;#totalCount&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> totalprice = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.total-price&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> carBody = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;#carBody&#x27;</span>)</span><br><span class="line"><span class="keyword">for</span> (<span class="keyword">let</span> num1 = <span class="number">0</span>; num1 &lt; btn1.<span class="property">length</span>; num1++) &#123;</span><br><span class="line">  total[num1].<span class="property">innerHTML</span> = price[num1].<span class="property">innerHTML</span></span><br><span class="line">  <span class="comment">// 1.加号操作</span></span><br><span class="line">  btn1[num1].<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    input[num1].<span class="property">value</span>++</span><br><span class="line">    btn[num1].<span class="property">disabled</span> = <span class="literal">false</span></span><br><span class="line">    <span class="comment">// console.log(parseInt(price[num1].innerHTML) * input[num1].value)</span></span><br><span class="line">    total[num1].<span class="property">innerHTML</span> = <span class="built_in">parseInt</span>(price[num1].<span class="property">innerHTML</span>) * input[num1].<span class="property">value</span> + <span class="string">&#x27;￥&#x27;</span></span><br><span class="line">    <span class="title function_">fn</span>()</span><br><span class="line">  &#125;)</span><br><span class="line">  <span class="comment">// 2.减号操作</span></span><br><span class="line">  btn[num1].<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    input[num1].<span class="property">value</span>--</span><br><span class="line">      total[num1].<span class="property">innerHTML</span> = <span class="built_in">parseInt</span>(price[num1].<span class="property">innerHTML</span>) * input[num1].<span class="property">value</span> + <span class="string">&#x27;￥&#x27;</span></span><br><span class="line">      <span class="keyword">if</span> (input[num1].<span class="property">value</span> &lt;= <span class="number">1</span>) &#123;</span><br><span class="line">        btn[num1].<span class="property">disabled</span> = <span class="literal">true</span></span><br><span class="line">      &#125;</span><br><span class="line">      <span class="title function_">fn</span>()</span><br><span class="line">  &#125;)</span><br><span class="line">  <span class="comment">// 4.删除操作</span></span><br><span class="line">  del[num1].<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="comment">// carBody.removeChild(carBody.children[num1])</span></span><br><span class="line">    carBody.<span class="title function_">removeChild</span>(<span class="variable language_">this</span>.<span class="property">parentNode</span>.<span class="property">parentNode</span>)</span><br><span class="line">    <span class="title function_">fn</span>()</span><br><span class="line">  &#125;)</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">// 3.计算总件/总价函数</span></span><br><span class="line"><span class="keyword">function</span> <span class="title function_">fn</span>(<span class="params"></span>) &#123;</span><br><span class="line">  <span class="keyword">let</span> total = <span class="variable language_">document</span>.<span class="title function_">querySelectorAll</span>(<span class="string">&#x27;.total&#x27;</span>)</span><br><span class="line">  <span class="keyword">let</span> input = <span class="variable language_">document</span>.<span class="title function_">querySelectorAll</span>(<span class="string">&#x27;.count-c input&#x27;</span>)</span><br><span class="line">  <span class="keyword">let</span> num2 = <span class="number">0</span></span><br><span class="line">  <span class="keyword">let</span> num3 = <span class="number">0</span></span><br><span class="line">  <span class="keyword">for</span> (<span class="keyword">let</span> num1 = <span class="number">0</span>; num1 &lt; total.<span class="property">length</span>; num1++) &#123;</span><br><span class="line">    num2 = num2 + <span class="built_in">parseInt</span>(input[num1].<span class="property">value</span>)</span><br><span class="line">    num3 = num3 + <span class="built_in">parseInt</span>(total[num1].<span class="property">innerHTML</span>)</span><br><span class="line">  &#125;</span><br><span class="line">  totalCount.<span class="property">innerHTML</span> = num2</span><br><span class="line">  totalprice.<span class="property">innerHTML</span> = num3 + <span class="string">&#x27;￥&#x27;</span></span><br><span class="line">&#125;</span><br><span class="line"><span class="title function_">fn</span>()</span><br></pre></td></tr></table></figure><h2 id="5-综合案例"><a href="#5-综合案例" class="headerlink" title="5. 综合案例"></a>5. 综合案例</h2><ol><li>需求：点击录入按钮，可以增加学生信息</li><li>本次案例主要目的是为了后面学习Vue做铺垫（数据驱动视图）</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 数据后端数据</span></span><br><span class="line"><span class="keyword">let</span> arr = [</span><br><span class="line">  &#123; <span class="attr">stuid</span>: <span class="number">1001</span>, <span class="attr">uname</span>: <span class="string">&#x27;欧阳霸天&#x27;</span>, <span class="attr">age</span>: <span class="number">19</span>, <span class="attr">gender</span>: <span class="string">&#x27;男&#x27;</span>, <span class="attr">salary</span>: <span class="string">&#x27;20000&#x27;</span>, <span class="attr">city</span>: <span class="string">&#x27;上海&#x27;</span> &#125;,</span><br><span class="line">  &#123; <span class="attr">stuid</span>: <span class="number">1002</span>, <span class="attr">uname</span>: <span class="string">&#x27;令狐霸天&#x27;</span>, <span class="attr">age</span>: <span class="number">29</span>, <span class="attr">gender</span>: <span class="string">&#x27;男&#x27;</span>, <span class="attr">salary</span>: <span class="string">&#x27;30000&#x27;</span>, <span class="attr">city</span>: <span class="string">&#x27;北京&#x27;</span> &#125;,</span><br><span class="line">  &#123; <span class="attr">stuid</span>: <span class="number">1003</span>, <span class="attr">uname</span>: <span class="string">&#x27;诸葛霸天&#x27;</span>, <span class="attr">age</span>: <span class="number">39</span>, <span class="attr">gender</span>: <span class="string">&#x27;男&#x27;</span>, <span class="attr">salary</span>: <span class="string">&#x27;2000&#x27;</span>, <span class="attr">city</span>: <span class="string">&#x27;北京&#x27;</span> &#125;,</span><br><span class="line">]</span><br><span class="line"></span><br><span class="line"><span class="comment">// 1.渲染函数</span></span><br><span class="line"><span class="keyword">let</span> tbody = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;tbody&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> btn = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.add&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> uname = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.uname&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> age = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.age&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> gender = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.gender&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> salary = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.salary&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> city = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.city&#x27;</span>)</span><br><span class="line"><span class="keyword">function</span> <span class="title function_">fn</span>(<span class="params"></span>) &#123;</span><br><span class="line">  <span class="comment">// 去掉以前数据 让点击的时候tr都没有</span></span><br><span class="line">  tbody.<span class="property">innerHTML</span> = <span class="string">&#x27;&#x27;</span></span><br><span class="line">  <span class="keyword">for</span> (<span class="keyword">let</span> num1 = <span class="number">0</span>; num1 &lt; arr.<span class="property">length</span>; num1++) &#123;</span><br><span class="line">    <span class="comment">// 创建tr标签 然后追加给tbody</span></span><br><span class="line">    <span class="keyword">let</span> tr = <span class="variable language_">document</span>.<span class="title function_">createElement</span>(<span class="string">&#x27;tr&#x27;</span>)</span><br><span class="line">    <span class="comment">// 给a添加一个序号 才能知道删除操作删除哪一个</span></span><br><span class="line">    tr.<span class="property">innerHTML</span> = <span class="string">`</span></span><br><span class="line"><span class="string">        &lt;tr&gt;</span></span><br><span class="line"><span class="string">          &lt;td&gt;<span class="subst">$&#123;arr[num1].stuid&#125;</span>&lt;/td&gt;</span></span><br><span class="line"><span class="string">          &lt;td&gt;<span class="subst">$&#123;arr[num1].uname&#125;</span>&lt;/td&gt;</span></span><br><span class="line"><span class="string">          &lt;td&gt;<span class="subst">$&#123;arr[num1].age&#125;</span>&lt;/td&gt;</span></span><br><span class="line"><span class="string">          &lt;td&gt;<span class="subst">$&#123;arr[num1].gender&#125;</span>&lt;/td&gt;</span></span><br><span class="line"><span class="string">          &lt;td&gt;<span class="subst">$&#123;arr[num1].salary&#125;</span>&lt;/td&gt;</span></span><br><span class="line"><span class="string">          &lt;td&gt;<span class="subst">$&#123;arr[num1].city&#125;</span>&lt;/td&gt;</span></span><br><span class="line"><span class="string">          &lt;td&gt;&lt;a href=&quot;javascript:&quot; id=&quot;<span class="subst">$&#123;num1&#125;</span>&quot;&gt;删除&lt;/a&gt;&lt;/td&gt;</span></span><br><span class="line"><span class="string">        &lt;/tr&gt;</span></span><br><span class="line"><span class="string">    `</span></span><br><span class="line">    <span class="comment">// 复原所有表单数据</span></span><br><span class="line">    tbody.<span class="title function_">appendChild</span>(tr)</span><br><span class="line">    uname.<span class="property">value</span> = age.<span class="property">value</span> = salary.<span class="property">value</span> = <span class="string">&#x27;&#x27;</span></span><br><span class="line">    gender.<span class="property">value</span> = <span class="string">&#x27;男&#x27;</span></span><br><span class="line">    city.<span class="property">value</span> = <span class="string">&#x27;北京&#x27;</span></span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">// 页面加载调用函数</span></span><br><span class="line"><span class="title function_">fn</span>()</span><br><span class="line"></span><br><span class="line"><span class="comment">// 2. 添加数据按钮</span></span><br><span class="line"><span class="comment">// 获得表单里的值 追加给数组 用push方法</span></span><br><span class="line">btn.<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line"><span class="comment">// 得到数组最后一条数据学号 1003 + 1</span></span><br><span class="line">  arr.<span class="title function_">push</span>(&#123;</span><br><span class="line">    <span class="attr">stuid</span>: arr[arr.<span class="property">length</span> - <span class="number">1</span>].<span class="property">stuid</span> + <span class="number">1</span>, </span><br><span class="line">    <span class="attr">uname</span>: uname.<span class="property">value</span>, </span><br><span class="line">    <span class="attr">age</span>: age.<span class="property">value</span>, </span><br><span class="line">    <span class="attr">gender</span>: gender.<span class="property">value</span>, </span><br><span class="line">    <span class="attr">salary</span>: salary.<span class="property">value</span>, </span><br><span class="line">    <span class="attr">city</span>: city.<span class="property">value</span></span><br><span class="line">  &#125;)</span><br><span class="line">  <span class="comment">// console.log(arr)</span></span><br><span class="line">  <span class="title function_">fn</span>()</span><br><span class="line">&#125;)</span><br><span class="line"></span><br><span class="line"><span class="comment">// 3. 删除操作 使用事件委托来删除数组数据</span></span><br><span class="line">tbody.<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params">e</span>) &#123;</span><br><span class="line">  <span class="comment">// 点击了A才能删除 用if判断tagNmae是否为A来删除</span></span><br><span class="line">  <span class="comment">// console.log(e.target.tagName);</span></span><br><span class="line">  <span class="keyword">if</span> (e.<span class="property">target</span>.<span class="property">tagName</span> == <span class="string">&#x27;A&#x27;</span>) &#123;</span><br><span class="line">    <span class="comment">// 删除数组里的数据</span></span><br><span class="line">    <span class="comment">// 给a添加一个序号 才能知道删除操作删除哪一个</span></span><br><span class="line">    arr.<span class="title function_">splice</span>(e.<span class="property">target</span>.<span class="property">id</span>, <span class="number">1</span>)</span><br><span class="line">  &#125;</span><br><span class="line">  <span class="title function_">fn</span>()</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><hr><h4 id="本节单词"><a href="#本节单词" class="headerlink" title="本节单词:"></a>本节单词:</h4><ol><li>keyup</li><li>keydown</li><li>enter</li><li>stopPropagation</li><li>mouseover</li><li>preventDefault</li><li>onclick</li><li>removeEventListener</li><li>target</li><li>tagName</li><li>page</li></ol></article><div class="post-copyright"><div class="post-copyright__author"><span 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fa-stream"></i><span>目录</span><span class="toc-percentage"></span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-3"><a class="toc-link" href="#DOM-%E4%BA%8B%E4%BB%B6%E9%AB%98%E7%BA%A7"><span class="toc-number">1.</span> <span class="toc-text">DOM- 事件高级</span></a></li></ol><li class="toc-item toc-level-2"><a class="toc-link" href="#1-%E4%BA%8B%E4%BB%B6%E5%AF%B9%E8%B1%A1"><span class="toc-number"></span> <span class="toc-text">1. 事件对象</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#1-%E8%8E%B7%E5%8F%96%E4%BA%8B%E4%BB%B6%E5%AF%B9%E8%B1%A1"><span class="toc-number">1.</span> <span class="toc-text">1. 获取事件对象</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#2-%E4%BA%8B%E4%BB%B6%E5%AF%B9%E8%B1%A1%E5%B8%B8%E7%94%A8%E5%B1%9E%E6%80%A7"><span class="toc-number">2.</span> <span class="toc-text">2. 事件对象常用属性</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E8%B7%9F%E9%9A%8F%E9%BC%A0%E6%A0%87%E6%A1%88%E4%BE%8B"><span class="toc-number">2.1.</span> <span class="toc-text">跟随鼠标案例:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%8C%89%E4%B8%8B%E5%9B%9E%E8%BD%A6%E5%8F%91%E5%B8%83%E5%BE%AE%E5%8D%9A%E6%A1%88%E4%BE%8B"><span class="toc-number">2.2.</span> <span class="toc-text">按下回车发布微博案例:</span></a></li></ol></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#2-%E4%BA%8B%E4%BB%B6%E6%B5%81"><span class="toc-number"></span> <span class="toc-text">2. 事件流</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#1-%E4%BA%8B%E4%BB%B6%E6%B5%81%E5%92%8C%E4%B8%A4%E4%B8%AA%E9%98%B6%E6%AE%B5%E8%AF%B4%E6%98%8E"><span class="toc-number">1.</span> <span class="toc-text">1. 事件流和两个阶段说明</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#2-%E4%BA%8B%E4%BB%B6%E6%8D%95%E8%8E%B7%E5%92%8C%E4%BA%8B%E4%BB%B6%E5%86%92%E6%B3%A1"><span class="toc-number">2.</span> <span class="toc-text">2. 事件捕获和事件冒泡</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E4%BA%8B%E4%BB%B6%E5%86%92%E6%B3%A1%E6%A6%82%E5%BF%B5"><span class="toc-number">2.1.</span> <span class="toc-text">事件冒泡概念:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E4%BA%8B%E4%BB%B6%E6%8D%95%E8%8E%B7%E6%A6%82%E5%BF%B5%EF%BC%9A"><span class="toc-number">2.2.</span> <span class="toc-text">事件捕获概念：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E8%AF%B4%E6%98%8E"><span class="toc-number">2.3.</span> <span class="toc-text">说明:</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#3-%E9%98%BB%E6%AD%A2%E4%BA%8B%E4%BB%B6%E6%B5%81%E5%8A%A8"><span class="toc-number">3.</span> <span class="toc-text">3. 阻止事件流动</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E9%BC%A0%E6%A0%87%E7%BB%8F%E8%BF%87%E4%BA%8B%E4%BB%B6%EF%BC%9A"><span class="toc-number">3.1.</span> <span class="toc-text">鼠标经过事件：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E9%98%BB%E6%AD%A2%E9%BB%98%E8%AE%A4%E8%A1%8C%E4%B8%BA%EF%BC%8C%E6%AF%94%E5%A6%82%E9%93%BE%E6%8E%A5%E7%82%B9%E5%87%BB%E4%B8%8D%E8%B7%B3%E8%BD%AC%EF%BC%8C%E8%A1%A8%E5%8D%95%E5%9F%9F%E7%9A%84%E8%B7%B3%E8%BD%AC"><span class="toc-number">3.2.</span> <span class="toc-text">阻止默认行为，比如链接点击不跳转，表单域的跳转</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E4%B8%A4%E7%A7%8D%E6%B3%A8%E5%86%8C%E4%BA%8B%E4%BB%B6%E7%9A%84%E5%8C%BA%E5%88%AB%EF%BC%9A"><span class="toc-number">3.3.</span> <span class="toc-text">两种注册事件的区别：</span></a></li></ol></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#3-%E4%BA%8B%E4%BB%B6%E5%A7%94%E6%89%98"><span class="toc-number"></span> <span class="toc-text">3. 事件委托</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#4-%E8%B4%AD%E7%89%A9%E8%BD%A6%E6%A1%88%E4%BE%8B"><span class="toc-number"></span> <span class="toc-text">4. 购物车案例</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#5-%E7%BB%BC%E5%90%88%E6%A1%88%E4%BE%8B"><span class="toc-number"></span> <span class="toc-text">5. 综合案例</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%9C%AC%E8%8A%82%E5%8D%95%E8%AF%8D"><span class="toc-number">0.1.</span> <span class="toc-text">本节单词:</span></a></li></ol></li></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/post/ds2s/" title="整个前端面试题"><img src="https://cdn1.tianli0.top/gh/web-xc/iMG/postss/vue.png" onerror='this.onerror=null,this.src="https://npm.elemecdn.com/webxc@1.0.2/banner/404.gif"' alt="整个前端面试题"></a><div class="content"><a class="title" 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